* R0 = Foreground speed, or -1 to read the current setting.
R1 = Background speed, or -1 to read the current setting.
* R0 = The current foreground speed.
R1 = The current background speed.
Purpose: Control the multitasking speed of the PC card.
Interrupts: Interrupt status is undefined.
Fast interrupts are enabled.
Processor mode: Processor is in SVC mode.
Re-entrancy: SWI is not re-entrant.
Use: This call has has a similar use to *ARMEdit_Polling.
Larger values increase the performance of the PC card at the expense of slowing down the desktop. A value of 0 results in the normal behaviour.
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